12887965 has 4 divisors (see below), whose sum is σ = 15465564. Its totient is φ = 10310368.

The previous prime is 12887933. The next prime is 12887993. The reversal of 12887965 is 56978821.

12887965 = 2538² + 2539².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56978821 = 653 ⋅87257.

It can be written as a sum of positive squares in 2 ways, for example, as 6441444 + 6446521 = 2538^2 + 2539^2 .

It is a cyclic number.

It is not a de Polignac number, because 12887965 - 2⁵ = 12887933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1288792 + ... + 1288801.

It is an arithmetic number, because the mean of its divisors is an integer number (3866391).

Almost surely, 2^12887965 is an apocalyptic number.

12887965 is the 2539-th centered square number.

It is an amenable number.

12887965 is a deficient number, since it is larger than the sum of its proper divisors (2577599).

12887965 is an equidigital number, since it uses as much as digits as its factorization.

12887965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577598.

The product of its digits is 241920, while the sum is 46.

The square root of 12887965 is about 3589.9811977224. The cubic root of 12887965 is about 234.4560529147.

The spelling of 12887965 in words is "twelve million, eight hundred eighty-seven thousand, nine hundred sixty-five".